Automatic stop mechanism



April' 22 1924.

' J. SCHUTZ AUTOMATI C STOP MECHANISM Filed July 5 1919 a/z/v Patented Apr. 22, 1924.

UNITED STATES PATENTOFFICE.

. nnwnnnena, or

ILLINOIS.

AUTOMATIC s'ror MECHANISM.

Application filed July 5,

To all whom it may concern Be it known that I, JOHN Borrow, a citizen of the United States residing at Chicago, in the county of dock and State of Illinois, have invented certain new and useful Improvements in Automatic Stop Mechanism, ofwhich the following is a specification. i

' My invention relates to improvements in automatic stop mechanisms for safe-guard ing knitted or woven fabrics.

It is generally well known that when moving threads or yarns, that are to constitute knitted or woven fabrics, are accidentally broken, in the'course of the knitting or weaving operation, or when a knot in the thread or arn is about to pass into. the machine, of which the fabric is made, such contingencies, if allowed to pass unnoticed, will cause the resultant fabric to be defective and not of primevalue.

When a large number of such fabricating' machines areunder the supervision of a single attendant, and a correspondingly large number of threads or yarns are associated with the machines, it is practically impossible to visually detect the aforesaid defects in time to prevent the resultant damage to the fabricated garment. In fact, to avoid the damage aforesaid, means must be provided to automatically stop the thread moving instrumentality the instant that the derangement occurs.

' The. present. invention provides such a means in. which the time element is reduced to the smallest component.

The arrangement is such. that the instant the thread is broken the safeguarding mechanism operates to effectively stop the fabricating machine before the severed end of the thread 'oryarn can reach the machine, and it is also so arranged that a knot in the thread, or yarn, cannot pass thru the stop mechanism and into the machine without first stopping the operation of the latter.

Other, further and more specific objects of my invention will become readily appar-. cut, to persons skilled in the art, from a consideration of the following description when taken in conjunction with the drawings,

wherein Fig. 1 is an and elevation of the thread guiding device shown in Fig. 2.

Fig. 2 is a side elevation, part in section,

1919. Serial in. 308,877.

in connection with which the stopping mechanism may be used. I FFig. 3 is a section takenon line 3-3 of 1 c l fig. 4 is a front elevation of the stopping mechanism showing one side wall in section. Fig. 5 is a section on line 5 -5 of Fig. 4. Fig. dis a section on line 66 of Fig. 4. In all the Views the same reference characters are employed to indicate. similar parts. I 1

The thread guide shown in Fig. 2 00mprises a frame 12 having a longer, arm 13 and two shorter arms 14 and 15. From the injunction 16 of the arms 13 and 15, and rearwardly of the frame arm 13, is a rod 17. Extending vertically fromthe frame arm 13 is a bearing car 18 in which is secured a which is pivoted, as at 28, to the lower end of the arm 14. Normally the lever 27 rests against-a laterally projecting stud 29, which is preferably an integral part ofthe stationary arm 14. A relatively small elongated shaft 30 is supported on the frame 11; There is fixed to the shaft 30, an arm 31, as by a. screw 32, and arm at is connected to the arm 31, as by a cord 33. Secured to the shaft 30, at a suitable point is'another arm 34, which isconnected by a cord 35 to the lever 36 of the stopping mechanism 37.

The mechanism 37 includes a casing 38 in which a vertically reciprocatable rod 39is normally held under tension, as shown in Fig. 5, by a helical extension spring 40. The rod 39 passes entirely thru the casing 38. The upper end 41 of the spring 40 is secured to the upper wall of the casing by screw 42. The lower end 43 of the spring is secured to the rod, by underlying the head of the screw 44.

The screw 44 passes entirely thru the rod and thru an elongated slot 45, in one of the side walls which is parallel with the movement of the rod 39. A latch lever 45' of a thread guide fora fabricating machine 30, and on its inturned end is provided with no two spacedapart arms 51 and 52 providing a space 53 thereb'etween to receive the screw 44. The upper end 54 of the latch 45, when released, is caused to pass thru a slot 57 in the side Wall 55 of the casing by alight yielding spring 56. The slot 57 is provided in the side wall 55 of the casing 37, thru which the upper end 54 of the latch lever 45 will pass, as shown in dotted lines in Fig.

I 4, when said lever is released, as at 58.

The rod 39 has been drawn down against the extension spring 40 that surrounds it, and is held in its down position by the screw 44 entering the space 53 between the arms 51 and 52 of the latch lever 45. When the rod 39 .is released, it will move up into the dotted line position, by the operation of the .spring 40, as shown in Fig. 5. The rod 39,

however, is held by the latch lever 45 and theupper end of the latch lever is retained in its holding position by the bell-crank lever 60, which is pivoted, as at 61, and is provided with a vertically extending arm 36 that passes thru a slot in the upper wall of the casing. The lever 60 is provided with a horizontally projecting arm 62 which is provided with a detent 63 and a stop 64 with an intervening notch 65, so that when the mechanism. 7 r

' 'Aspring 66 holds the arm 62 of the'lever 60 in depressed position so that it will automatically engage the upper end 54 of the latch memberx45, when the rod 39 is drawn downwardly to set the mechanism. Theoperation of the lever 60 is sensitive and its adjustment with respect to the upper end 54 of the latch lever 45 mustrbe' accurate and to this end I provide an adjusting screw 67 'having a tapered point 68'and a set nut 69. The tapered point engages the inner edge of the vertical arm36 of the bell crank lever and determines the engagement of the detent63 with the upper end 54 of the latch lever.

Now from the foregoing description it will be manifest that when a knot, such as the knot 70, in the cord or string 71, passes between thetw'o parallel spaced apart arms of the pivoted lever 27, that it will move the latter into the position shown in Fig. :2 and said lever will encounter the laterally projecting stud 26, on the lever 24, thereby moving the lever 31 which oscillates a shaft and thereby moves the lever 34, and this lever, being connected by a cord with the lever 26 of the bellcrank lever, will release the latch lever which will liberate the vertically movable rod 39 and the latter will be quickly and violently moved into a position shown in dotted lines in Fig. 5 by the energy stored in the spring 40.

' Having described my invention, what I claim is V An organized structure for stopping a fabricating machine upon occurrence of an abnormal condition of a thread, comprising a casing; a rod extending thru opposite walls of the casing for disconnectingsaid machine from its driving power; an open helical spring, within the casing surrounding the rod and bearing against one wall of the casing to yieldingly hold the rod in position into which it is movedrby the spring; a latch lever pivoted at one side of the rod near the bottom-of the casing having an elongated end and a' short end; a pin extending from one side of the rod passing thru an elongated slot in the casing, to prevent rotation of the rod and to engage the short end of the latch lever'to hold the rod depressed against the tension of its operating spring; a spring pressed lever near the upper end of the easing, having one end projecting thrua slot in the casing and another end for engaging the elongated end of the latch lever and means to disengage the aforesaid levers to release the spring and move the rod. 7

In testimony whereof I hereunto subscribe my name;

' JOHN SGHUTZ. 

